Data Licensing Information for the U.S. Environmental Protection Agency

Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105.
More details on the U.S. Public Domain license are available here:

Additionally, please be advised that although these data have been processed successfully on a computer system at the U.S. EPA, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. EPA shall not be held liable for improper or incorrect use of the data.